[Lightning-dev] Turbo channels spec?

Rusty Russell rusty at rustcorp.com.au
Tue Jun 29 05:34:18 UTC 2021


Hi all!

        John Carvalo recently pointed out that not every implementation
accepts zero-conf channels, but they are useful.  Roasbeef also recently
noted that they're not spec'd.

How do you all do it?  Here's a strawman proposal:

1. Assign a new feature bit "I accept zeroconf channels".
2. If both negotiate this, you can send update_add_htlc (etc) *before*
   funding_locked without the peer getting upset.
3. Nodes are advised *not* to forward HTLCs from an unconfirmed channel
   unless they have explicit reason to trust that node (they can still
   send *out* that channel, because that's not their problem!).

It's a pretty simple change, TBH (this zeroconf feature would also
create a new set of channel_types, altering that PR).

I can draft something this week?

Thanks!
Rusty.


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